25mm Countersink DIN 335C 90° Four-Flute HSS RUnaTEC Coated, Right-Hand Shank With Three Flats - Ruko GmbH

Take advantage of the combination of HSS construction, RunaTEC coating and a 4‑flute geometry to achieve faster, quieter countersinking with reduced feed force and a consistently clean finish; order directly via Metav Werkzeuge or contact our consultants for application support.

RUKO ULTIMATECUT 4S countersink — HSS, RUnaTEC‑coated, 90° Ø25 mm

The RUKO ULTIMATECUT 4S is a 4‑flute HSS countersink engineered for precision chamfering of steel in both stationary machines and manual drilling operations.

• HSS base material with RUnaTEC coating
• 4 flutes for fast, clean countersinking
• 90° tip for standard countersink geometry
• Shank with three flats for secure clamping

Faster production and lower effort through optimised geometry

The four‑flute design combined with HSS substrate and the RunaTEC coating reduces cutting friction and requires significantly less feed force, which translates into higher throughput and lower operator fatigue. The tool is specified for a feed in steel up to 800 N: 0.24 mm/rev, a useful reference when setting machine parameters; this means the cutter can be pushed at relatively high feeds without sacrificing finish, enabling up to 50% faster countersinking and potentially three times the number of holes between tool changes compared with conventional designs.

Smooth, chatter‑free finishing for reliable countersink quality

The 90° geometry and the balanced 4‑flute geometry produce a consistently clean sink profile with minimal tendency to leave rattle marks or chatter scars. Right‑hand cutting and the optimised flute form deliver an extremely quiet run and an optimal countersink pattern, reducing the need for secondary finishing operations. This predictability is particularly valuable in small‑batch production and repair work where surface quality must be reliable without extensive rework.

Secure clamping and wide machine compatibility

The cylindrical shank with three flats ensures secure clamping in drill chucks and arbors, preventing slippage during higher feeds or when using handheld drills. Conforming to DIN 335 C and with a nominal diameter of 25 mm and 90° countersink angle, the cutter integrates easily into standard workshop setups and production lines. Its construction supports both bench drills and column drilling machines, providing a versatile sinking tool suitable for general workshop and industrial applications.

Contact Metav Werkzeuge for expert advice on selecting the correct RUKO countersink for specific steel grades and to arrange reliable supply from Emmerich.

Technical Data

• Article number: 4000605556NW
• Product designation: Kegelsenker ULTIMATECUT 4S DIN 335C 90Grad D.25mm HSS RUnaTEC Z.4 RUKO
• Manufacturer: Ruko GmbH
• Packaging unit: 1
• UID: 4000605556NW

Facts

• Diameter: 25 mm
• Countersink angle: 90°
• Flutes: 4
• Standard: DIN 335 C
• Feed in steel (up to 800 N): 0.24 mm/rev
• Right‑hand cutting
• Shank: three flats

Special features

• Material: HSS
• Coating: RUnaTEC‑coated
• Best performance in stationary and manual use
• Reduced feed force required
• Up to 3× more countersinks possible under comparable conditions
• Up to 50% faster countersinking
• Extremely smooth running behaviour
• Optimal countersink finish without chatter marks

FAQ

What materials can be machined with this countersink?
The RUKO ULTIMATECUT 4S is designed primarily for steel applications; its HSS construction and RUnaTEC coating make it suitable for general workshop steels and comparable materials.

Which machines are suitable for this countersink?
The cutter is compatible with bench drills, column drilling machines and handheld drills when clamped securely by the shank with three flats; it follows DIN 335 C dimensions for straightforward integration.

How should feed and speed be set for reliable results?
A guideline from the tool data indicates a feed in steel up to 800 N: 0.24 mm/rev; combine this with appropriate spindle speed for the steel grade to balance chip evacuation and finish quality.

Does the RUnaTEC coating extend tool life?
Yes, the RunaTEC coating reduces friction and wear, which helps increase the number of successful countersinks per tool life and improve run stability.

What is included in the delivery?
The item is supplied as a single unit (packaging unit: 1) under article number 4000605556NW.

Manufacturer / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com